NAME

ocf_heartbeat_Xen - Manages Xen unprivileged domains (DomUs)

SYNOPSIS

DESCRIPTION

Resource Agent for the Xen Hypervisor. Manages Xen virtual machine instances by mapping cluster resource start and stop, to Xen create and shutdown, respectively.

A note on names

We will try to extract the name from the config file (the xmfile attribute). If you use a simple assignment statement, then you should be fine. Otherwise, if there's some python acrobacy involved such as dynamically assigning names depending on other variables, and we will try to detect this, then please set the name attribute. You should also do that if there is any chance of a pathological situation where a config file might be missing, for example if it resides on a shared storage. If all fails, we finally fall back to the instance id to preserve backward compatibility.

Para-virtualized guests can also be migrated by enabling the meta_attribute allow-migrate.

This resource agent may be configured for native migration if available in the cluster manager. For Pacemaker, the allow-migrate="true" meta attribute enables native migration.

SUPPORTED PARAMETERS

xmfile

Absolute path to the Xen control file, for this virtual machine.

(required, string, default "/etc/xen/vm/MyDomU")

name

Name of the virtual machine.

(optional, string, no default)

shutdown_timeout

The Xen agent will first try an orderly shutdown using xl shutdown. Should this not succeed within this timeout, the agent will escalate to xl destroy, forcibly killing the node.

If this is not set, it will default to two-third of the stop action timeout.

Setting this value to 0 forces an immediate destroy.

(optional, string, no default)

shutdown_acpi

Handle shutdown by simulating an ACPI power button event. Enable this to allow graceful shutdown for HVM domains without installed PV drivers.

(optional, boolean, default 0)

allow_mem_management

This parameter enables dynamic adjustment of memory for start and stop actions used for Dom0 and the DomUs. The default is to not adjust memory dynamically.

(optional, boolean, default 0)

node_ip_attribute

In case of a live migration, the system will default to using the IP address associated with the hostname via DNS or /etc/hosts.

This parameter allows you to specify a node attribute that will be queried instead for the target node, overriding the IP address. This allows you to use a dedicated network for live migration traffic to a specific node.

Warning: make very sure the IP address does point to the right node. Or else the live migration will end up somewhere else, greatly confusing the cluster and causing havoc.

(optional, string, no default)

reserved_Dom0_memory

In case memory management is used, this parameter defines the minimum amount of memory to be reserved for the dom0. The default minimum memory is 512MB.

(optional, string, default "512")

autoset_utilization_cpu

If set true, the agent will detect the number of domain's vCPUs from Xen, and put it into the CPU utilization of the resource when the monitor is executed. Before enabling make sure node utilization is also set (using NodeUtilization agent or manually) or the resource might not be able to start anywhere.

(optional, boolean, default false)

autoset_utilization_hv_memory

If set true, the agent will detect the number of memory from Xen, and put it into the hv_memory utilization of the resource when the monitor is executed. Before enabling make sure node utilization is also set (using NodeUtilization agent or manually) or the resource might not be able to start anywhere.

(optional, boolean, default false)

monitor_scripts

To additionally monitor services within the unprivileged domain, add this parameter with a list of scripts to monitor.

(optional, string, no default)

SUPPORTED ACTIONS

This resource agent supports the following actions (operations):

start

Starts the resource. Suggested minimum timeout: 60s.

stop

Stops the resource. Suggested minimum timeout: 40s.

migrate_from

Executes steps necessary for migrating the resource away from the node. Suggested minimum timeout: 120s.

migrate_to

Executes steps necessary for migrating the resource to the node. Suggested minimum timeout: 120s.

monitor

Performs a detailed status check. Suggested minimum timeout: 30s. Suggested interval: 10s.

meta-data

Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5s.

validate-all

Performs a validation of the resource configuration. Suggested minimum timeout: 5s.

EXAMPLE CRM SHELL

The following is an example configuration for a Xen resource using the crm(8) shell:

primitive p_Xen ocf:heartbeat:Xen \
  params \
    xmfile="/etc/xen/vm/MyDomU" \
  meta allow-migrate="true" \
  op monitor depth="0" timeout="30s" interval="10s"

EXAMPLE PCS

The following is an example configuration for a Xen resource using pcs(8)

pcs resource create p_Xen ocf:heartbeat:Xen \
  xmfile="/etc/xen/vm/MyDomU" \
  op monitor OCF_CHECK_LEVEL="0" timeout="30s" interval="10s"

AUTHOR

ClusterLabs contributors (see the resource agent source for information about individual authors)